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https://www.readbyqxmd.com/read/29675896/verbal-working-memory-related-neural-network-communication-in-schizophrenia
#1
Thomas Kustermann, Tzvetan Popov, Gregory A Miller, Brigitte Rockstroh
Impaired working memory (WM) in schizophrenia is associated with reduced hemodynamic and electromagnetic activity and altered network connectivity within and between memory-associated neural networks. The present study sought to determine whether schizophrenia involves disruption of a frontal-parietal network normally supporting WM and/or involvement of another brain network. Nineteen schizophrenia patients (SZ) and 19 healthy comparison subjects (HC) participated in a cued visual-verbal Sternberg task while dense-array EEG was recorded...
April 19, 2018: Psychophysiology
https://www.readbyqxmd.com/read/29675717/electromagnetic-neuronavigation-for-the-percutaneous-treatment-of-trigeminal-neuralgia-with-balloon-compression-technical-note-and-cadaveric-validation-study
#2
Anthony Wiggins, Megan Lonie, Iona Pimentil, Nicola Newall, Peter Bodkin, Asha Venkatesh
BACKGROUND: Several techniques have been described for the percutaneous treatment of trigeminal neuralgia; however, each has significant drawbacks. We propose a new technique for percutaneous balloon compression of the trigeminal ganglion and distal trigeminal nerve using electromagnetic (EM) neuronavigation. METHODS: The procedure was performed in 17 consecutive patients with trigeminal neuralgia. Patients were then followed up with telephone interview. We also performed a cadaveric validation study to further investigate the accuracy of the technique using dye...
April 19, 2018: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29675149/computer-aided-design-of-metal-chalcohalide-semiconductors-from-chemical-composition-to-crystal-structure
#3
Daniel W Davies, Keith T Butler, Jonathan M Skelton, Congwei Xie, Artem R Oganov, Aron Walsh
The standard paradigm in computational materials science is INPUT: Structure; OUTPUT: Properties, which has yielded many successes but is ill-suited for exploring large areas of chemical and configurational hyperspace. We report a high-throughput screening procedure that uses compositional descriptors to search for new photoactive semiconducting compounds. We show how feeding high-ranking element combinations to structure prediction algorithms can constitute a pragmatic computer-aided materials design approach...
January 28, 2018: Chemical Science
https://www.readbyqxmd.com/read/29674746/gold-nanof%C3%A3-ve-surface-enhanced-raman-spectroscopy-visualizes-hypotaurine-as-a-robust-anti-oxidant-consumed-in-cancer-survival
#4
Megumi Shiota, Masayuki Naya, Takehiro Yamamoto, Takako Hishiki, Takeharu Tani, Hiroyuki Takahashi, Akiko Kubo, Daisuke Koike, Mai Itoh, Mitsuyo Ohmura, Yasuaki Kabe, Yuki Sugiura, Nobuyoshi Hiraoka, Takayuki Morikawa, Keiyo Takubo, Kentaro Suina, Hideaki Nagashima, Oltea Sampetrean, Osamu Nagano, Hideyuki Saya, Shogo Yamazoe, Hiroyuki Watanabe, Makoto Suematsu
Gold deposition with diagonal angle towards boehmite-based nanostructure creates random arrays of horse-bean-shaped nanostructures named gold-nanofève (GNF). GNF generates many electromagnetic hotspots as surface-enhanced Raman spectroscopy (SERS) excitation sources, and enables large-area visualization of molecular vibration fingerprints of metabolites in human cancer xenografts in livers of immunodeficient mice with sufficient sensitivity and uniformity. Differential screening of GNF-SERS signals in tumours and those in parenchyma demarcated tumour boundaries in liver tissues...
April 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29673322/the-spatio-temporal-dynamics-of-deviance-and-target-detection-in-the-passive-and-active-auditory-oddball-paradigm-a-sloreta-study
#5
Christoph Justen, Cornelia Herbert
BACKGROUND: Numerous studies have investigated the neural underpinnings of passive and active deviance and target detection in the well-known auditory oddball paradigm by means of event-related potentials (ERPs) or functional magnetic resonance imaging (fMRI). The present auditory oddball study investigates the spatio-temporal dynamics of passive versus active deviance and target detection by analyzing amplitude modulations of early and late ERPs while at the same time exploring the neural sources underling this modulation with standardized low-resolution brain electromagnetic tomography (sLORETA) ...
April 19, 2018: BMC Neuroscience
https://www.readbyqxmd.com/read/29672916/magic-angle-spinning-nmr-with-metallized-rotors-as-cylindrical-microwave-resonators
#6
Faith J Scott, Erika L Sesti, Eric J Choi, Alexander J Laut, Jagadishwar R Sirigiri, Alexander B Barnes
We introduce a novel design for millimeter wave electromagnetic structures within magic angle spinning (MAS) rotors. In this demonstration, a copper coating is vacuum deposited onto the outside surface of a sapphire rotor at a thickness of 50 nanometers. This thickness is sufficient to reflect 197 GHz microwaves, yet not too thick as to interfere with radiofrequency fields at 300 MHz or prevent sample spinning due to eddy currents. Electromagnetic simulations of an idealized rotor geometry show a microwave quality factor of 148...
April 19, 2018: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/29671449/sers-polarization-dependent-effects-for-an-ordered-3d-plasmonic-tilted-silver-nanorod-array
#7
Renxian Gao, Yongjun Zhang, Fan Zhang, Shuang Guo, Yaxin Wang, Lei Chen, Jinghai Yang
Hexagonal close-packed tilted Ag nanorod arrays that exhibit excellent uniformity and reproducibility were prepared. The tilt angle was easily controlled by regulating the sputtering angle, accompanied by a reduction and constancy in the gap size of adjacent nanorods, which is 30° and 90° relative to the sputtering direction. The surface enhanced Raman spectroscopy (SERS) technique was used to characterize the interaction of tilted Ag nanorod arrays with polarized laser excitation. Interestingly, the SERS polarization-dependence increased with increasing tilt angle of the Ag nanorods...
April 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29670503/mobile-phone-chips-reduce-increases-in-eeg-brain-activity-induced-by-mobile-phone-emitted-electromagnetic-fields
#8
Diana Henz, Wolfgang I Schöllhorn, Burkhard Poeggeler
Recent neurophysiological studies indicate that exposure to electromagnetic fields (EMFs) generated by mobile phone radiation can exert effects on brain activity. One technical solution to reduce effects of EMFs in mobile phone use is provided in mobile phone chips that are applied to mobile phones or attached to their surfaces. To date, there are no systematical studies on the effects of mobile phone chip application on brain activity and the underlying neural mechanisms. The present study investigated whether mobile phone chips that are applied to mobile phones reduce effects of EMFs emitted by mobile phone radiation on electroencephalographic (EEG) brain activity in a laboratory study...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29670350/colloidal-plasmonic-gold-nanoparticles-and-gold-nanorings-shape-dependent-generation-of-singlet-oxygen-and-their-performance-in-enhanced-photodynamic-cancer-therapy
#9
Yamin Yang, Yue Hu, Henry Du, Lei Ren, Hongjun Wang
Introduction: In recognition of the potentials of gold nanoparticles (Au NPs) in enhanced photodynamic therapy (PDT) for cancer, it is desirable to further understand the shape-dependent surface plasmonic resonance (SPR) properties of various gold nanostructures and evaluate their performances in PDT. Materials and methods: Monodispersed colloidal spherical solid Au NPs were synthesized by UV-assisted reduction using chloroauric acid and sodium citrate, and hollow gold nanorings (Au NRs) with similar outer diameter were synthesized based on sacrificial galvanic replacement method...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29670177/proton-decoupled-carbon-magnetic-resonance-spectroscopy-in-human-calf-muscles-at-7-t-using-a-multi-channel-radiofrequency-coil
#10
Sigrun Goluch, Roberta Frass-Kriegl, Martin Meyerspeer, Michael Pichler, Jürgen Sieg, Martin Gajdošík, Martin Krššák, Elmar Laistler
13 C magnetic resonance spectroscopy is a viable, non-invasive method to study cell metabolism in skeletal muscles. However, MR sensitivity of 13 C is inherently low, which can be overcome by applying a higher static magnetic field strength together with radiofrequency coil arrays instead of single loop coils or large volume coils, and 1 H decoupling, which leads to a simplified spectral pattern. 1 H-decoupled 13 C-MRS requires RF coils which support both, 1 H and 13 C, Larmor frequencies with sufficient electromagnetic isolation between the pathways of the two frequencies...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29669689/3-dimensional-cervical-movement-characteristics-and-the-influence-of-thoracic-treatment-on-a-subgroup-of-acute-neck-pain-patients
#11
Nikolas L Krott, Gunnar M Bloyinski, Erik Cattrysse
OBJECTIVE: The purpose of this study was to investigate the influence of thoracic high-velocity low-amplitude thrust (HVLAT) manipulation on quantitative and qualitative 3-dimensional cervical spine kinematic patterns in a subgroup of patients with acute neck pain. METHODS: Thirty patients with acute neck pain, aged 20 to 59, received a thoracic HVLAT manipulation. Three-dimensional kinematics of the cervical spine were registered pretreatment and posttreatment using an electromagnetic tracking system...
April 15, 2018: Journal of Manipulative and Physiological Therapeutics
https://www.readbyqxmd.com/read/29668852/meg-working-memory-n-back-task-reveals-functional-deficits-in-combat-related-mild-traumatic-brain-injury
#12
Ming-Xiong Huang, Sharon Nichols, Ashley Robb-Swan, Annemarie Angeles-Quinto, Deborah L Harrington, Angela Drake, Charles W Huang, Tao Song, Mithun Diwakar, Victoria B Risbrough, Scott Matthews, Royce Clifford, Chung-Kuan Cheng, Jeffrey W Huang, Anusha Sinha, Kate A Yurgil, Zhengwei Ji, Imanuel Lerman, Roland R Lee, Dewleen G Baker
Combat-related mild traumatic brain injury (mTBI) is a leading cause of sustained cognitive impairment in military service members and Veterans. However, the mechanism of persistent cognitive deficits including working memory (WM) dysfunction is not fully understood in mTBI. Few studies of WM deficits in mTBI have taken advantage of the temporal and frequency resolution afforded by electromagnetic measurements. Using magnetoencephalography (MEG) and an N-back WM task, we investigated functional abnormalities in combat-related mTBI...
April 13, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29667938/suggested-design-of-gold-nanoobjects-based-terahertz-radiation-source-for-biomedical-research
#13
Andrei Postnikov, Kamil Moldosanov
Gold nanoparticles (GNPs) may serve as "devices" to emit electromagnetic radiation in the terahertz (THz) range, whereby the energy is delivered by radio frequency or microwave photons which won't by themselves induce transitions between sparse confinement-shaped electron levels of a GNP, but may borrow the energy from longitudinal acoustic phonons to overcome the confinement gap. Upon excitation, the Fermi electron cannot relax otherwise than via emitting a THz photon, the other relaxation channels being blocked by force of shape and size considerations...
April 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29667844/lower-extremity-biomechanics-during-a-drop-vertical-jump-in-participants-with-or-without-chronic-ankle-instability
#14
C Collin Herb, Kaitlyn Grossman, Mark A Feger, Luke Donovan, Jay Hertel
CONTEXT:   Chronic ankle instability (CAI) is a condition characterized by range-of-motion, neuromuscular, and postural-control deficits and subjective disability, reinjury, and posttraumatic osteoarthritis. Differences have been reported in kinematics, kinetics, surface electromyography (EMG), and ground reaction forces during functional tasks performed by those with CAI. These measures are often collected independently, and the research on collecting measures simultaneously during a movement task is limited...
April 18, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29667602/localized-surface-plasmon-resonance-modulation-of-totally-encapsulated-vo2-au-vo2-composite-structure
#15
Jiran Liang, Jinbang Guo, Yirui Zhao, Ying Zhang, Tianyu Su
We design and fabricate a totally encapsulated VO2/Au/VO2 composite structure which is aimed to improve the tunability of the localized surface plasmon resonance (LSPR) peak. In this work, the structure will ensure all the Au NPs' resonant electric field area was filled with VO2. The modulation range of the totally encapsulated structure is larger than that of the semi-coated structure. To further improve the modulation range, we also explore the VO2 thickness dependence of the structure's LSPR modulation. With the increase of the top-layer VO2 thin film thickness, the modulation range become larger...
April 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29667447/exposure-to-non-ionizing-electromagnetic-fields-emitted-from-mobile-phones-induced-dna-damage-in-human-ear-canal-hair-follicle-cells
#16
Mehmet Akdag, Suleyman Dasdag, Fazile Canturk, Mehmet Zulkuf Akdag
The aim of this study was to investigate effect of radiofrequency radiation (RFR) emitted from mobile phones on DNA damage in follicle cells of hair in the ear canal. The study was carried out on 56 men (age range: 30-60 years old)in four treatment groups with n = 14 in each group. The groups were defined as follows: people who did not use a mobile phone (Control), people use mobile phones for 0-30 min/day (second group), people use mobile phones for 30-60 min/day (third group) and people use mobile phones for more than 60 min/day (fourth group)...
April 18, 2018: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/29665564/a-new-method-for-plastic-strain-measurement-with-rayleigh-wave-polarization
#17
Cuixiang Pei, Siqi Zhao, Tianhao Liu, Zhenmao Chen
In this work, a new non-contact and coupling-free ultrasound method with measuring Rayleigh wave polarization (RWP) by electromagnetic acoustic transducers (EMATs) is applied for plastic strain measurement, which can provide a very promising alternative and reference-free ultrasonic testing technique with high spatial resolution. Two specially designed EMAT receivers are developed to measure the polarization of Rayleigh wave generated by an enhanced meander-line-coil EMAT. The change in RWP due to the plastic strain has been successfully measured...
April 11, 2018: Ultrasonics
https://www.readbyqxmd.com/read/29665217/ultrahigh-conductive-copper-large-flake-size-graphene-heterostructure-thin-film-with-remarkable-electromagnetic-interference-shielding-effectiveness
#18
Zhe Wang, Boyang Mao, Qianlong Wang, Jun Yu, Jixiang Dai, Rongguo Song, Zonghua Pu, Daping He, Zhi Wu, Shichun Mu
To guarantee the normal operation of next generation portable electronics and wearable devices, together with avoiding electromagnetic wave pollution, it is urgent to find a material possessing flexibility, ultrahigh conductive, and superb electromagnetic interference shielding effectiveness (EMI SE) simultaneously. In this work, inspired by a building bricks toy with the interlock system, we design and fabricate a copper/large flake size graphene (Cu/LG) composite thin film (≈8.8 μm) in the light of high temperature annealing of a large flake size graphene oxide film followed by magnetron sputtering of copper...
April 17, 2018: Small
https://www.readbyqxmd.com/read/29665110/illusion-thermotics
#19
Run Hu, Shuling Zhou, Ying Li, Dang-Yuan Lei, Xiaobing Luo, Cheng-Wei Qiu
"Fata Morgana" or "Mirage" phenomena have long been captivated as optical illusions, which actually relies on gradient-density air or vapor. Man-made optical illusions have witnessed significant progress by resorting to artificially structured metamaterials. Nevertheless, two long-standing challenges remain formidable: first, exotic parameters (negative or less than unity) become inevitable; second, the signature of original object is altered to that of a virtual counterpart. It is thus not able to address the holy grail of illusion per se, since a single virtual object still exposes the location...
April 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29662453/response-of-cultured-neuronal-network-activity-after-high-intensity-power-frequency-magnetic-field-exposure
#20
Atsushi Saito, Masayuki Takahashi, Kei Makino, Yukihisa Suzuki, Yasuhiko Jimbo, Satoshi Nakasono
High-intensity and low frequency (1-100 kHz) time-varying electromagnetic fields stimulate the human body through excitation of the nervous system. In power frequency range (50/60 Hz), a frequency-dependent threshold of the external electric field-induced neuronal modulation in cultured neuronal networks was used as one of the biological indicator in international guidelines; however, the threshold of the magnetic field-induced neuronal modulation has not been elucidated. In this study, we exposed rat brain-derived neuronal networks to a high-intensity power frequency magnetic field (hPF-MF), and evaluated the modulation of synchronized bursting activity using a multi-electrode array (MEA)-based extracellular recording technique...
2018: Frontiers in Physiology
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